公开(公告)号：US09191051B1

公开(公告)日：2015-11-17

申请号：US13727882

申请日：2012-12-27

Applicant: Marvell International Ltd.

Inventor： Ravi Narasimhan ,  Hemanth Sampath

IPC: H04J11/00 ,  H04B1/38

CPC classification number: H04B1/38 ,  H04B7/0447 ,  H04B7/0671 ,  H04B7/0697 ,  H04J13/004 ,  H04L1/0637 ,  H04L5/0023 ,  H04L5/0044 ,  H04L5/0053 ,  H04L27/2613

Abstract: A transceiver comprising a transmit section and a frame formatter. The transmit section is configured to operate in a first mode and a second mode and transmit frames of data in the first mode and the second mode. The frame formatter is configured to operate in the first mode and the second mode. While operating in the first mode, the frame formatter is configured to generate a first frame of data in a first format, and the transmit section is configured to transmit a single set of long training symbols prior to transmitting the first frame of data. While operating in the second mode, the frame formatter is configured to generate a second frame of data in a second format, and the transmit section is configured to transmit a plurality of sets of long training symbols prior to transmitting the second frame of data.

Abstract translation: 收发器，包括发送部分和帧格式化器。 发送部分被配置为以第一模式和第二模式操作，并且在第一模式和第二模式中发送数据帧。 帧格式化器被配置为在第一模式和第二模式下操作。 当在第一模式下操作时，帧格式化器被配置为以第一格式生成第一数据帧，并且发送部分被配置为在发送第一数据帧之前发送单组长训练符号。 当在第二模式下操作时，帧格式化器被配置为以第二格式生成第二数据帧，并且发送部分被配置为在发送第二数据帧之前发送多组长训练符号。

公开(公告)号：US08929487B1

公开(公告)日：2015-01-06

申请号：US14143722

申请日：2013-12-30

Applicant: Marvell International Ltd.

Inventor： Ravi Narasimhan

IPC: H04L27/06 ,  H04L27/26 ,  H04L25/02

CPC classification number: H04L27/2659 ,  H04L25/0204 ,  H04L27/2621 ,  H04L27/2657 ,  H04L27/2663 ,  H04L27/2671 ,  H04L27/2675 ,  H04L27/2695

Abstract: A channel estimator for a wireless network receiver. The channel estimator includes a plurality of first circuits, each of the plurality of first circuits configured to multiply a respective channel estimate by a corresponding frequency domain signal, wherein the channel estimates correspond to an orthogonal frequency division multiplexing signal received by the wireless network receiver. A second circuit is configured to output a sum of results of multiplying the respective channel estimates by the corresponding frequency domain signals. A third circuit is configured to calculate, based on the sum, a correction factor, wherein the correction factor corresponds to a complex number representation of the respective channel estimates. A fourth circuit is configured to output, based on the correction factor and a previously calculated channel estimate, an updated channel estimate corresponding to the orthogonal frequency division multiplexing signal received by the wireless network receiver.

Abstract translation: 无线网络接收机的信道估计器。 信道估计器包括多个第一电路，多个第一电路中的每一个被配置为将相应的信道估计乘以对应的频域信号，其中信道估计对应于由无线网络接收机接收的正交频分复用信号。 第二电路被配置为输出将各个信道估计乘以相应的频域信号的结果之和。 第三电路被配置为基于总和来计算校正因子，其中校正因子对应于各个信道估计的复数表示。 第四电路被配置为基于校正因子和先前计算的信道估计，输出与由无线网络接收机接收的正交频分复用信号相对应的更新信道估计。

公开(公告)号：US08619922B1

公开(公告)日：2013-12-31

申请号：US13660580

申请日：2012-10-25

Applicant: Marvell International Ltd.

Inventor： Ravi Narasimhan

IPC: H04L27/06

CPC classification number: H04L27/2659 ,  H04L25/0204 ,  H04L27/2621 ,  H04L27/2657 ,  H04L27/2663 ,  H04L27/2671 ,  H04L27/2675 ,  H04L27/2695

Abstract: A method for updating channel estimates in an orthogonal frequency division multiplexing receiver of a wireless local area network includes generating channel estimates for an orthogonal frequency division multiplexing subcarrier as a function of subcarrier index values. The method includes generating a complex number by summing a product of frequency domain signals and the channel estimates for each of the subcarrier index values and dividing the sum by a sum of a squared absolute value of the channel estimate for each of the subcarrier index values. The method includes multiplying the complex number by the channel estimates to generate updated channel estimates.

Abstract translation: 一种用于在无线局域网的正交频分复用接收机中更新信道估计的方法包括：生成正交频分复用子载波的信道估计，作为子载波索引值的函数。 该方法包括通过对频域信号的乘积和每个子载波索引值的信道估计相加来产生复数，并将和除以每个子载波索引值的信道估计的平方绝对值之和。 该方法包括将复数乘以信道估计以产生更新的信道估计。